Owners of smartphones of the Xiaomi, Redmi i POCO line are often faced with the need to save important phone numbers on physical media. Transferring contacts from the device's internal memory directly to SIM card is a proven backup method that guarantees access to the phone book even if the gadget breaks down or data is lost in the cloud. Despite the development of cloud services, physical storage of numbers remains in demand for those who often change devices or are afraid of information leaks.
The procedure for exporting data in a shell MIUI or new HyperOS has its own characteristics that differ from clean Android. The interface may vary depending on the firmware version and regional location of the device. You will need to pay close attention to menu items as names may vary slightly. We will look at a detailed algorithm of actions that will allow you to safely copy the entire phone book to the telecom operator's chip without losing important records.
It is worth immediately noting that SIM card capacity limited by the technical characteristics of the chip. Unlike the internal memory of a smartphone or Google account, where you can save thousands of entries with photos and additional fields, a SIM card usually holds from 250 to 500 numbers. In addition, when transferring, the contact name is often cut off or additional numbers are lost if they are tied to one record. Therefore, before starting mass data migration, it is recommended to audit the phone book.
Preparing the phone book for export
Before proceeding with the actual transfer, you need to make sure that your data is in the correct state. Often, users store contacts in different sources at the same time: some in their account Google, some in the phone’s memory, and old entries may remain on the previous SIM card. For successful export, all records must be consolidated in a single device storage. Open the application Contact and check the display filter.
Click on the three dots or the menu icon in the upper corner of the screen and select Display contacts. Make sure that all available sources are activated, including Phone and SIM card. If you see disjointed lists, it's best to merge the duplicates first. The system Xiaomi offers a built-in tool for merging duplicate entries, which will avoid confusion after the transfer.
⚠️ Attention: When copying long names to a SIM card, they may be trimmed to 10-15 characters due to limitations in the data storage format on the chip. It is better to move critical notes in names to the “Notes” field or save them separately.
It is also worth checking if among your contacts there are records associated exclusively with instant messengers or social networks. Such records cannot be exported to a SIM card, since they are not full-fledged telephone numbers in the classical sense. Clearing the list of junk before the procedure will save your time and storage space.
☑️ Preparing for transfer
Step-by-step guide for transferring through the Contacts application
The main method of data migration is implemented through a standard call management application. The algorithm of actions is intuitive, but requires care when choosing the target media. Go to the application Contact on your smartphone Redmi. In the upper right corner, find an icon with three dots or a gear, indicating settings or an additional menu.
In the list that opens, select the item Import and export contacts. This section is the central hub for all phone book operations. The system will offer several options: import from a SIM card, export to a SIM card, and also work with files of the VCFformat. We are interested in exporting to external media.
Click on the button Export to SIM card. The smartphone will ask you to confirm the action, since the operation is irreversible in terms of data formatting (names may be truncated). After confirmation, the system will begin the copying process. If you have two SIM cards installed in your phone, the device will prompt you to choose which one of them (SIM 1 or SIM 2) you should write information to.
- 📱 Select all contacts or tick only those that are necessary transfer.
- 💾 Confirm the start of the operation by pressing the button
OKorExport. - ⏳ Wait for the process to complete without removing the SIM card or blocking screen.
- ✅ Check the result by opening the contact list with the "SIM Only" filter.
The execution time of the operation directly depends on the number of records. If there are several hundred numbers, the process may take one to three minutes. At this moment, it is not recommended to run heavy applications or games so as not to create unnecessary load on the processor and RAM of the device.
If you have a dual-SIM smartphone, before exporting, temporarily disable the second SIM card in the settings so as not to accidentally write contacts to an unused chip.
An alternative method is through the system settings
Sometimes the standard contacts application may not work correctly or have a modified interface in custom firmware builds. In this case, you can use the system phone settings menu, which duplicates the data management functions. This method is especially relevant for older versions MIUI, where the menu logic was different from the modern one.
Go to general Settings of your smartphone Xiaomi. Scroll down the list to the section Applications or use the settings search by entering the query "contacts". You need to find the system application responsible for storing the phone book. In some firmware versions, this item is placed in a separate section System applications.
Inside the contact management menu, find the section Import/Export. The logic of actions here is completely similar to that described above: you select the source (Phone memory) and recipient (SIM card). The only difference is the navigation path. This method often helps if the application shortcut on the desktop has been deleted or changed.
⚠️ Attention: The settings interface may differ depending on the version of Android and the MIUI/HyperOS shell. If you don't find the "Import and Export" option right away, use the search bar at the top of the settings menu.
Using system settings also allows you to manage application permissions. Make sure the Contacts app has access to read and write SIM card data. Without the appropriate permissions, the export operation will fail, even if you complete all the steps correctly.
What to do if the export button is grayed out?
If the "Export to SIM" button is gray and cannot be pressed, check whether the SIM card memory is completely full. Also make sure that there are actually contacts in the phone's memory available for copying, and not just those already on the SIM card.
SIM card storage format limitations
It is important for users to understand the technical limitations of the medium to which they plan to transfer data. SIM card uses an outdated storage standard information that was developed decades ago when telephones were used solely for making calls. A modern smartphone stores much more metadata about each subscriber than the operator’s chip can accommodate.
When transferring, you will encounter truncated names. If the contact is recorded as “Ivan Ivanovich Petrov (Worker)”, it can be saved on the SIM card as “Ivan Ivanovich Pe” or simply “Ivan”. This is due to the character limit in the GSM standard name field. In addition, additional numbers (mobile, work, home in one card) are often not supported - only one main number will be saved.
| Parameter | Phone memory / Google | SIM card |
|---|---|---|
| Max. number of contacts | Unlimited (thousands) | 250 - 500 pcs. |
| Name length | Up to 200+ characters | 10 - 15 characters |
| Contact photo | Supported | Not supported |
| Additional. numbers (fax, office) | Supported | Usually 1 number |
| Email and addresses | Supported | Not supported |
Email addresses, residential addresses and notes will be irretrievably lost when exported to a SIM card. That is why experts recommend using this method only to create an emergency copy of basic numbers, and not as the main way to store a phone book in the era of smartphones.
A SIM card is only suitable for storing basic data (Name + Number). For a complete backup, use export to a VCF file or synchronization with the cloud.
Solving common problems and errors
During the transfer process, device users Redmi i Xiaomi may encounter various errors. The most common problem is a message that the SIM card memory is full. Even if you deleted old numbers, the system may not immediately update the index of free cells. Try rebooting your smartphone after manually clearing the SIM card through the control menu.
Another common situation is the absence of an export button or incorrect detection of the second SIM card. Make sure that in the settings Dual SIM cards and mobile networks both slots are active. Sometimes temporarily removing the card and reinstalling it after cleaning the contacts of the metal part with an alcohol wipe helps.
- 🔋 Low battery error: The system may block data recording if the battery charge is below 15-20%. Connect the charger.
- 🚫 Lack of access rights: Check in the application settings whether access to contacts is allowed for system services.
- 📵 Incorrect number format: Some international numbers with long country codes may not be recorded due to line length limits.
If none of the methods helps, Perhaps the SIM card itself is physically worn out or damaged. In this case, it is advisable to contact the operator’s communication center to replace the chip with a new one while maintaining the number. Old large format cards, cut with nano-SIM scissors, often fail when writing data.
⚠️ Attention: If you are using a very old SIM card (produced more than 10 years ago), it may not support modern UTF-8 name encoding. Cyrillic names may appear as hieroglyphs or question marks.
Comparison of data backup methods
Although transferring to a SIM card is a popular request, for ecosystem owners Android there are more effective methods of saving data. Export to file VCF allows you to save the entire structure of the contact, including photos and additional fields. This file can be sent to your email, saved to cloud storage, or transferred to your computer.
Synchronization with your account Google is the most reliable way. When you log into a new phone using the same login, all contacts will be restored automatically. Unlike a SIM card, the cloud does not have strict capacity restrictions and allows you to edit contacts from any device, including a computer via a browser.
Nevertheless, the SIM card remains a universal key. It does not require the Internet, passwords or account settings. For older people or in emergency situations when the smartphone is reset to factory settings, having base numbers on the operator chip becomes a lifesaver. Therefore, knowing the export procedure to SIM is an important skill for any user Xiaomi.
It is recommended to combine methods: keep the main database in the Google or Mi Cloud, and duplicate the most important numbers (relatives, emergency services) onto a physical SIM card. This approach ensures maximum data safety in any scenario.
How to restore contacts from a VCF file?
Open the Contacts application, go to Settings → Import/Export → Import from device memory. Select the previously saved .vcf file and the system will automatically add all entries to the phone book.
Is it possible to transfer contacts with photos to a SIM card?
No, the technical standard of SIM cards does not support storing graphic images. When exporting, contact photos will be deleted. To save photos, use export to a VCF file or synchronization with a Google account.
What should I do if, after transferring, the names are displayed in hieroglyphs?
This is an encoding problem. Old SIM cards may not display the Cyrillic alphabet correctly. Try changing the system language to English, performing the migration, and then returning to Russian. If this does not help, you need to replace the SIM card with a new one from the operator.
How many contacts can a modern Xiaomi SIM card hold?
The capacity depends on the operator and the type of chip, but the standard range is from 250 to 500 entries. The exact number of free cells is displayed during the export process before confirming the operation.
Will information be deleted from the phone after copying to the SIM card?
No, the export operation creates a copy of the data. The original contacts will remain in the memory of your smartphone Redmi or Xiaomi unchanged. Deletion will occur only if you manually start the procedure for clearing the phone memory.